<!--
    单元格合并
    rowspan列
    colspan行
-->
<html>
    <head>
        <title>表格</title>
        <meta charset="UTF-8">
        <body>
            <table border="2px"  align="center" width="50%" height="50px">
                <tr>
                    <td>1</td>
                    <td>2</td>
                    <td rowspan="2">3</td>
                </tr>
                <tr>
                    <td>1</td>
                    <td>2</td>
                    <td>3</td>
                </tr>
                <tr>
                    <td colspan="2">1</td>
                    <td>3</td>
                </tr>

            </table>
        </body>
    </head>
</html>